Mirroring parts when attached to a single stack node on another part cannot be done. The way this works (as can be seen in bicouplers to quadcouplers to maybe even the MH engine plates) is as follows: The parent part must have stack nodes in position for symmetry. All of these must have the name node_stack_somethingIdentical = ... Then the part must also have the key stackSymmetry = x (where x is n - 1, the number of these identical nodes - 1). A quadcoupler will have stackSymmetry = 3
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